linux-kernel - Re: [PATCH 3/3] ovl: Use real disk UUID for origin file handles

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Message-ID: <ee38734b-c4c3-4b96-8ff2-b4ce5730b57c@igalia.com>
Date: Fri, 23 Jan 2026 10:24:50 -0300
From: André Almeida <andrealmeid@...lia.com>
To: Amir Goldstein <amir73il@...il.com>
Cc: Christoph Hellwig <hch@....de>, Chuck Lever <chuck.lever@...cle.com>,
 Jeff Layton <jlayton@...nel.org>, NeilBrown <neil@...wn.name>,
 Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>,
 Tom Talpey <tom@...pey.com>, Carlos Maiolino <cem@...nel.org>,
 Chris Mason <clm@...com>, David Sterba <dsterba@...e.com>,
 Miklos Szeredi <miklos@...redi.hu>, Christian Brauner <brauner@...nel.org>,
 Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
 linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 Qu Wenruo <wqu@...e.com>, linux-btrfs@...r.kernel.org,
 linux-unionfs@...r.kernel.org, kernel-dev@...lia.com, vivek@...labora.com,
 Ludovico de Nittis <ludovico.denittis@...labora.com>
Subject: Re: [PATCH 3/3] ovl: Use real disk UUID for origin file handles


Em 22/01/2026 17:07, Amir Goldstein escreveu:
> On Tue, Jan 20, 2026 at 4:12 PM Amir Goldstein <amir73il@...il.com> wrote:
>>
>> On Mon, Jan 19, 2026 at 5:56 PM André Almeida <andrealmeid@...lia.com> wrote:
>>>
> ...
>>> Actually they are not in the same fs, upper and lower are coming from
>>> different fs', so when trying to mount I get the fallback to
>>> `uuid=null`. A quick hack circumventing this check makes the mount work.
>>>
>>> If you think this is the best way to solve this issue (rather than
>>> following the VFS helper path for instance),
>>
>> That's up to you if you want to solve the "all lower layers on same fs"
>> or want to also allow lower layers on different fs.
>> The former could be solved by relaxing the ovl rules.
>>
>>> please let me know how can
>>> I safely lift this restriction, like maybe adding a new flag for this?
>>
>> I think the attached patch should work for you and should not
>> break anything.
>>
>> It's only sanity tested and will need to write tests to verify it.
>>
> 
> Andre,
> 
> I tested the patch and it looks good on my side.
> If you want me to queue this patch for 7.0,
> please let me know if it addresses your use case.
> 

Hi Amir,

I'm still testing it to make sure it works my case, I will return to you 
ASAP. Thanks for the help!

> Thanks,
> Amir.